Sledge mill



-Sept.'8, 1925.

T. J. STURTEVANT SLEDGE MILL Filed May 25, 1925 5 Sheets-Sheet 1 l ll i Sept. 8, 1925. 1,553,293

r. J. STURTEVANT SLEDGE MILL Filed May 23, 1925 5 Sheets-Sheet 5 mwm Am 7% TORNEY MENTOR Sept. 8, 1925.

T. J. STU RTEVANT SLEDGE MILL Filed May 23, 1925 5 Sheets-Sheet 4 Sept. 8, 1925.

1,553,293 T. J. STURTEVANT Y SLEDGE MILL Filed May 23, 1925 5 Sheets-Sheet 5 //V l ENTOFP:

ORNEY" Patented Sept. 8, 1925.

"PATENT snares swsssvers 9r mues .lressesssss ss assesses r -severeex-a MILL s lemn 9r asses; A1 sasraseflq i 9F Mescare es- L 'F ire-La Application filled May 23, ms. Serial No. 32,390.

To all whom it may concern;-

Be it known that I, Tit-IOMAS J. STURTE- vAN-T, a citizen of the'United States, res id ing at lVellesley, in the county of Norfolk and State of Massaehusettshave invented certain new and useful Improveme-n ts'in Sledge Mills, of which the [following is a specific a-tion.

' The invention to be hereinafter described relates to sledge m;i-lls of the type in wh ch rotary sledgesior hammers are employed for reducing materials.

Oneefthe'purposes of the invention is to:

provide a mill having a casing formed of sheetsteel stiflen'ed to 'give' the' inlll adequate strength to withstand the' hard V which these/ mills experience.

Another pu-rpose'oif the invention is to provide amill having sheet steel sides'a-nd lining plates spaced from said sides and 'se cured thereto, the construction belng such that outward bulge ordistor-tionbet the lining plates will net be shared by the sides of the'casing. 1

Another purpose of the invention is to provide a mill having; provision enabling ready access to the hammers for -the purpose of adjusting the same orgsubstituti-ng new hammers for old ones, and having-provision permitting the shaft carrying the hammers and the bearings at said shaft'to be readily introduced to and removed from the casing.

Another purpose of the inventignds to provide a mill having grate bars whlch may readily be introduced into the casingor removed therefrom. g

W'ith the aforesaid and other purposes'in view, the character of the inventionmaylbe best understood by reference to the following description of one good form thereof shown in the accompanying drawings, wherein:

Fig. 1 is a side elevation of a slsdge mill embodying the invention;

Fig; 2 is a view partly in front elevation and partly 1n vertical sec tlonof the mill; F 1g. 3 isa vertical transverse section taken on line o-fF-ig. 2;

Fig. 4- is a View similar to Fig. 3 showing. the door in open position and the shaft and hammers carried thereby'slid outward to furnish readyaceess to the hammers; 1

braeketste the casing;

. Fig. 8 iSfa-si -le elevation of the slideand Splitcol'lar; and. v

Fig.9 is an end View of a" group of grate bars and spacers. e i Y Referring to the drawings, the sledge mill shown therein as one good form of the in'-' vention, co1np rises a casing having opposed sides 1 formed o f-sheet steeL' and 'an -upper side 3 (Figs; 1',3'a1 1d 4) formed of channels 5' extending .side-by si'de with their flanges riveted together, said p r side 3. being connected to the sides l-by angle irons secured byrivets to the sides 1 and by :bolts tdthe upper side. V

Therear side 9 (Fig. 3) of the casing comprises 'a pair of channels 11 having flanges riveted together and above the rear side is a chute 13' formed oifsheet metal, and closfingwthe space above the chute isa plate 15.

The channels 11, chute and plate 15 are secured by bolts to upright angle bars secured by rivets to the side plates 1.

Atftlie'tront of the casingis aplate 17 (Figs.'1,.2 and'3) secured. by rivets to a base angle .bar 19and to angle bar-21. Above the angle bar 21 at the top of the easpingis an ag' lebar 23 secured by bolts to a channel of the upper side of the casing, a

spacing .plate' 25".being interposed between said'angle-bar and'cha-nnel.

. s ace between the angle bars 21 and 23 is norma-llyfclosed by a' door 27 comprisinga sheet steel plate/'29, an upper angle bar '31, and a lower angle bar having flanges secured rivets'to'the plate-29. Thedoor stifi'ened by'uprig-ht angle bars 'secured by rivets to theplate 29.' 'A vertical hinge shaft 3.7projects through holes in the door angle 31' and 33 through registering holes in the angle bars-21 and 23. A spaciin washer 3%)i's interposed between opposite anges of the anglebars 31 and 33,

and the shaft is prevented trom d'ropping through the holes bya pin 411 resting upon one or'thefianges 9f the angle bar 23 door is held in closed position by bolts 13 (Fig. 5) entered through the door plate 29 and an upright angle bar 4L5 secured by rivets to one of the sides 1.

" upper side 3 of the casing, and are secured thereto by bolts 57 having heads which are bolts extend.

flush with the inner surfaces of said plates, said lining plates being spaced from the upper side by bars 59 through which the A channel 61 (Fig. 3) is provided beneath the upper side, and is secured thereto by bolts 63, said channel being spaced from the upper side by the bars 59 referred to. A baffle plate 65 is interposed between the channel 61 and one of the lining plates 55, and is secured to a flange of the channel by bolts 67. I

Lining plates 69 are connected by bolts 71 to Z-bar brackets 73 secured by rivets to the inner face of the door plate 29. The heads of the bolts 71 are flush with the inner face of the door lining plates 69.

Since all of the lining plates are detachably supported by bolts, they may be readily removed when they become worn and others substituted therefor. The lining plates are spaced from the sides and from the door, and consequently any distortion which they may experiencein the use of the mill. will not be imparted to the outer sides or the door of the casing.

A pair of curved grate support bars 75 (Figs. 2 and 3)are secured by bolts 77 to the sides 1 of the casing, and said bars are spaced. from the are shaped lining plates 19 referred to. A series of grate bars 79 are mounted on the support bars 75 and have ends in the space between the are shaped plates 19 and the support bars 75. Between the bars at the ends thereof are spacers 81.

These bars and spacers. are arranged in groups (Fig. 9), the bars and spacers of each group being secured together by curved rivets. Between'the chute and the end of the grate adjacent thereto are a pair of wide bars 83. Between the door lining plate 69 and the endof the grate adjacent thereto are a pair of wide bars 85. These bars 83 and 85 are for the purpose of filling spaces at the ends of the grate.

Bearing brackets 87 (Fig. 2) are secured by bolts 89 to the sides 1 of the casing, and said bolts pass through square holes 90 in? keepers 91 (Fig, 7) placed against the inner faces of the side walls 1. Said keepers pre-- vent the bolts from turning when their nuts.

are set up. Each of the brackets has a base 93 from which projects a. collar 95 carrying a curved seat 97, and strengthening ribs 99 extend from the base to the seat.

Mounted in the curved seats of the brackets are self-alining Hyatt roller bearings 101, each comprising a housing 103 having ends 105 provided with grooves for receiving packing. Rollers 107 are mounted in the housing between the ends 105 thereof.

The bearings are retained in the open seats of the brackets by yokes 109 which have legs entered through bosses 111 on the brackets, the end portions of the legs being threaded to receive nut-s 113. The construct-ion is such that the bearings may be laterally presented to the seats of the brackets, and the legs of the yokes may be inserted in the bosses. Then the nuts may be set up tightly against ends of the bosses, thereby to draw the yokes into close embracing engagement with the bearings and hold the latter securely in the brackets. hen it is desired to remove the bearings from the brackets, this may be quickly and easily accomplished by releasing the nuts and withdrawing the yokes from the brackets.

Journalled in the bearings 101 is a shaft 115 having a carrier 117 fastthereon comprising a series of collars 119 spaced by washers 121. These collars have holes 122 therein through which pass rods 123. Series of sledges or hammers 125 have holes therein through which the rods 123 pass, said hammers being mounted between the collars 119. The rods have cotter pins 129 at the opposite ends thereof, the construction being such that the rods may be withdrawn from the collars and hammers when it is desired to remove the latter from their carrier.

The holes 122 in the collars are located at different radial distances from the shaft, and thus permit the hammers to be disposed at different radial distances from the shaft. This is of advantage in permitting the ham mers to be adjusted outwardly after they have become worn to prolong the service thereof.

An important feature of the invention relates to the construction of the mill which provides for ready access to the hammers and the parts associated therewith. To ac complish this, the sides 1 of the casing are provided with elongated openings 131 (Figs. 1 to 4) which are normally closed by covers, in the present instance in the form of slides 133 (Figs. 1 to 5). Each of these slides comprises a pair of plates 135 which are somewhat wider than the opening 131, an-c between said plates is a plate 137 of the same width as the opening. The plates 135 and 137 are secured together by screw bolts 139 which also carry a lining plate 141 which is spaced from the inner plate 135 by washers 1t3on the bolts 139., The outer plate 135 is somewhat longer than the inner Mounted on the shaft (arei split; collars 149 v 1" r Rig; 8) co np risingwparts; 149?,and E1 19," and .1 -,having,-fgrooves{ for; receiving: packing. The collamparts'.lt9i-iare riyeted olrt'he sides 10f .lU'ftllG; casing. i Eben/collar; parts-:; 149 il1aVe .mflanges' 1:51 vhich2 overlap thewintermediate ;plates 13? 10f ethe slides rzanda aref'securedrfoundatlon.

'irthe re-to by'bvoltsl1153. 1 The construction ;lS-ji*SL10l1 thatszaftertlie 15!.Td0'01. has bB'GHi'BA-SllyZ swung on'itsl vertical hinge-shaft tozitsroperr*poitiomethe handles 5 i 145 of? the; slidessniay'irbe;'rgr aspedy and the 1 xslid-es-1together Witha-rthe; 'collar;aparts 149 cmayebe pulle d outward. TihlSBil'tLblGS v ready ace-access :tdii'bea l1ad rP-to;:'theIxhamme carrying 1 rods'vlfi la'throngh ,Ione oraitheswotherarot'rthe elongated openings 131 in the sides 1 of1the ,1; casing. 'The:operatorv maysreach in through 'iOne' Of the1openii1gs il3lv=and-irremove the-Loot- 1 7.: terwp'ins' 129115112111) one oi the ro'ds-123. t-iThen he: maya pullrathe rodi'from' the i carrier, out

' :th-rou'gh atheiiether. :opening; aiid fthereby; rc

f move 1 from; the-T carrier! the "hammers: carried by the rod; 2' The"nperatonmayiprogressiyely -turn"the'izcarrieriitd bring 'ZYlSlI G QtlIGIXIOClS in 3 r-line' with :the i openings,sso'ath'aztzrthe. hammers on said rods imayebe 'remoyechin 4 a manrner 1 similar; to. that gush-described.

ilf' iff iscdesired toarepair; the shaft @ornthe 95bearrings,v ropes-imay-zbe loopedabouti the rend :portions e1 "theishafti which: project beyond tllQtlOOl is swung to op'en position, ,and thus risaiid =pl ates ---are convenientlyaccessible gtor ether-purpose of removing; the plates fromthe 1 adoorf andsubst-ituting=--neW \ones-tortherold ;ones.- v When the door is 1 open, readyaaccess may i be-liad-sto-the grate bars which; maybe -re'adily"slid-: outwardalong theirs-supporting .hars,- and 416W;. 0I18S.i1l1& -bc ;'easi-ly w'SllbSl/l" tuted foriold-ones.

"lhe casing has a large/ base hich-enables them-ill to bemounted With stability-on, its

Theoconstr-uction of"tl1e-;11iill;-iS:Suclnthat, wit desired, it maybe Shipped in-kn-ocls-down; form to the: place Where "it is to zbe used. qW hens. the parts of the mill reach th-eirndes- 1 tination; they '-may; be quickly I and easily reassembled; \To/accomplishthis, the; sides of wthecasing are bolted together, the-:chu-te is; --bo-lted= to the rearyside, the door is/presented tothe casing andvits hingeshaft; is-placed in position; the grate-barsare introduced in groups through the door opening and slid along their support: bars -into-position; rthe 'bear ing bIHCkBtSyRIB bolted *tOaSlClQS of the casingythejshaft. Wi-thkthe hammer carrier :f 'and bearings thereon are. {introduced 7 tol-the --casing-as described, andtheyok'es'areap 3 plied tov secure" the bearingsyto thei r vs'upa -porting brackets.

In use the materials to.be reduced r a-refed ;=along :the chute 13 into the casing. :The

shaft'isrotated in a clockwise direction I (Fig.

andthehammers. smash; against the materials-andbat ter themwagainst-the linings of o'ppositefsidess'of'ithe i casing sand-dthe ileo s -uppe id oft-hec ng; .ag2 1 b eb fle :i may berigged tortormi arsling tors" supporting the shaft. Then thezyo kesll w'amay be 40 removedi fromfthe'Ibraieketsaiand Jthef shaft, :the2bearingsirandithe canrieryttlrereon may be xrswung outwardt'ipast xthe'- door, I and an the course of this movement,xthe'zshafeuflkpass "throughtheselongated openings11-31. It is necessary-i0 'pp'ortvthe'sh'aft51in? somea suitflable fashions removing Ethel samea frnm'ithe casing; *since the shaft and (the arts (carried thereby arei'iofflreayy; massivevconstruction. sHowever', "the construction isg'siiehethati :the

r zsha ft 1 =Ican be; quickly; a and eeasilyir-removec from the casing-a.nda'returned thereto. 'iAfter If the: shaft r ha s abeen, FIG-IDOYQCl; rat-he bearings 2 may-; bezreadily slid":tlongzto thezends :of and 'oflvfroma the shaft, i ifz-adesir-e-d. "Before'ithe shaft iszremoved from the casing; itheawide r bars 85-r and theiigroupaiof gratez-ibars adj acentwth'eretoaare remo edj ifrom the g easing in order that rthey may mot: einus'rfere-:-Witl1-'vthespij'ritaand scope of: the, appended claims.

-65 -and againstthex'loor: lining 69. t-Theqnai ter-ia'ls: are: reduced thes impacts, ;andare further reduced asthe ha1nmers swipepast: the; grate. lVhen ethe materials-"have been reduced to .sutlicient :fineness they pass down through the; spaces between :the; grate bars, and; are; delivered through i'thel open -bottoin =01 :thecasing. I a i It will be understood that the invention is 'not :limitedto the? ispecifio telnbodiment -"Sl1OW119u2lI1Cl that; various; deviations may be :madel there-form Without dep arting from the JVhatis claimed is: V

.1. .Av sledge mill "comprising,- in combination, a casing-having a doorg bearing brackets mounted at :opposed sides of the casing; and remote; from: said door," bearings. carriedby said brackets, a shaft ournalled in said beari-ings,-= a: carrieraon the shaft/"having holes wtherein, erods "entered: through said holes,

= passageof#thehammernarrier. hammers mountedonwsaidrods, said-opposed 6O Thezzdo'or -isvso large that'wheniit isropen, I a readyraccessmaymerhaditoithe;lining plates for the purposeuof ltremoving, the jvsamezand t 'substitutingg YIIGWU'EOIIQS ffOIFiltlh. Worn :i ones.

.7 -:Si1 1ce theplates 69mm mountedson (the door,

'- they are car iadnoufiwtmm zthm casing-when sides ofrthe casing-having openingstherein; and cove-rs .;no -r1nallyclosing ;said'- openings and'edapted to. be-opened, thereby to give access 6110* the :TOdS for removing them-same through said open-ings frome' the carrier. r

' 2. A; sledgezmill comprising, 2in oombination, a casing having a hinged door, bearing brackets mounted at opposed sides of the casing and having yokes detachably connected thereto, bearings secured by said yokes to said brackets, a shaft journalled in said bearings, a carrier on the shaft, hammers mounted on the carrier, openings in said opposed sides of the casing extending from the shaft to the door, and covers normally closing said openings and adapted to be opened to permit the bearings, shaft and carrier to be moved out from the casing.

3. A sledge mill comprising, in combination, a casing having a door hinged thereto, and at one side thereof bearing brackets mounted at opposed sides of the casing, bearings, means detachably to secure the bearings in the brackets, a shaft journalled in said bearings, a carrier on the shaft, hammers mounted on the carrier, said carrier and hammers being located Within the casing away from the door, said opposed sides of the casing having openings therein extending from the shaft to the door, and covers normally closing said openings.

4:. A sledge mill comprising, in combination, a casing having a door, bearings at opposed sides of the casing, a shaft journalled in said bearings, a carrier on said shaft, hammers connected to the carrier, a side of the casing having an openii'ig therein sufli ciently large to permit the hammers to be removed therethrough from the casing, and a cover normally closing said opening.

5. A sledge mill comprising, in combination, a casing having a door, bearings at opposed sides of the casing, a shaft journalled in said bearings, a carrier on said shaft, hammers connected to the carrier, said sides of the casing having openings therein, covers normally closing said openings and adapted to be moved, thereby to furnish ready access to the hammers, and lining plates for the interior of the casing including lining plates secured to the covers and movable therewith.

6. A sledge mill comprising, in combination, a casing having a door hinged thereto on a vertical axis, brackets secured to opposed sides of the casing and having lateral openings facing the door, bearings carried by said brackets, means detachably to secure the bearings to the brackets, a shaft journalled in said bearings, hammers carried by the shaft, said opposed sides of the casing having openings extending from the shaft to the door, and plates normally closing the openings and adapted to be opened to permit the shaft to be moved .in a direction transverse to the length thereof through said openings out from the casing.

7. A sledge mill comprising, in combination, a casing having a side formed of separate channels secured together, lining plates at the interior of the casing secured to said side and spaced therefrom sufiiciently to prevent distortion of said plates from being imparted to said channels, a door for the casing, bearings at opposed sides of the easing, a shaft in said bearings, and hammers carried by said shaft.

8. A sledge mill comprising, in combination, a casing having a side formed of channels, a lining secured to and spaced from said side, a door at one side of the casing, a lining secured to and spaced from the door, bearings at opposed sides of the casing, a shaft journalled in said bearings, and hammers carried by said shaft.

9. A sledge mill comprising, in combination, a casing having an upper side formed of channels, a door for one side of the casing, lining plates secured to and spaced from said upper side and door, bearings at opposed sides of the casing, a shaft journalled in said bearings, and hammers carried by said shaft.

10. A sledge mill comprising, in combination, a casing having a side formed of separate channels secured together, a door for the casing, bearings at opposed sides of the casing, ashaft journalled in said bearings, hammers carried by the shaft, and a grate in said casing beneath said shaft.

11. A sledge mill comprising, in combination, a casing having an upper side formed of channels having their flanges riveted together, a door for the casing :hinged thereto on a vertical axis, bearings at opposed sides of the casing, a shaft journalled in said bearings, hammers carried by the shaft, and a chute at a side of the casing opposite the door for conducting materials into the in- .terior of the casing.

12. A sledge mill comprising, in combination, a casing having a side formed ofchannels, a lining secured to said side, a door for the casing, a lining secured to the door, supports secured to opposed sides of the casing, grate bars mounted on said supports, bearings at said opposed sides of the casing, a shaft journalled in said bearings, and hammers carried by said shaft and movable past said grate bars, said grate bars being movable transversely along said'supports out through the door opening.

13. A sledge mill comprising, in combination, a casing having a door, bearing brackets at opposed sides of said casing, bearings mounted in said brackets, a shaft journalled in said bearings, hammers carried by said shaft, openings in opposed sides of the casing extending from the shaft to the door, slides normally covering said openings and movable to uncover the same, and split collars on the shaft, each having a part secured to one of the slides.

14. Asledge mill comprising, in combination, a casing having a door, bearing brackets at opposed sides of said casing,

bearings mounted'in said brackets, a shaft journalled in said bearings, hammers carried by said shaft, openings in opposed sides of the casing extending from the shaft to the cover, slides normally covering said openings and movable to uncover the same, and split collars on the shaft, each having a part secdured to the casing and a part secured to a sli e.

15. A sledge mill comprising, in combination, a casing having a door, brackets mounted on opposed sides of the casing at the exterior thereof, bearings mounted in said brackets, a shaft journalled in said bear-' ings and extending through said opposed sides of the casing, hammers carried by the shaft, and collars on the shaft at opposed sides of the casing and having provision for packings to prevent escape of material from the interior of the casing along the shaft.

16. A sledge mill comprising, in combination, a sheet steel casing having a door, brackets at opposed sides of the casing and at the exterior thereof, bolt keepers opposed to said brackets at the interior of'the casing, bolts entered through said opposed sides of the casing, brackets and keepers, bearings mounted in the brackets, a shaft journalled in said bearings, and hammers carried by the shaft.

17 A sledge mill comprising, in combination, a casing, brackets secured to opposed sides of the casing, bearings carried by said brackets, a shaft journalled in said bearings, hammers carried by said shaft, said opposed sides of the casing having openings extending from the shaft to the door, two part collars on the shaft, slides connectedto parts of said collars and normally closing said openings, said slides being movable toward the door to enable ready access to the hammers.

18. A sledge mill comprising, in combination, a casing having a door hinged thereto on a vertical axis, bearings at opposed sides of the casing, a shaft journalled in said bearings, and hammers carried by the shaft, said hammers being wholly within said casing, said opposed sides of the casing having openings extending from the shaft to the 'door, and said shaft being movable through said openings toward the door to enable ready access to the hammers.

19. A sledge mill comprising, in combination, a casing having a door hinged thereto on a vertical axis, and elongated openings in opposed sides of said casing, bearings catedexteriorly of the casing, a shaft extending through said openings and journalled in said bearings, means on said shaft for reducing materials, said shaft being laterally movable through said openings .to

ward the door, and means normally closing the portions of said openings not occupied by the shaft.

20. A sledge mill comprising, in combination, a casing having a door at one side thereof, bearings at opposed sides of the casing, a shaftjournalled in said bearings, a carrier on the shaft, rods on the carrier extending parallel to the shaft, hammers mounted on the rods, said casing having an] opening adjacent the end of the carrier and separate from the door opening through which the rods may be drawn longitudinally to remove the hammers from the carrier, and means normally closing said opening.

21. A. sledge mill comprising casing sides,

a door, a chute, grate bars, bearing brackets,

a shaft, a carrier on the shaft, and hammers on the carrier, said parts being. constructed and arranged so that they may be shipped in knock-down form and readily assembled at their destination.

' THOMAS J. STURTEVANT. 

